(AP) -- President Bush warned Americans on Thursday to be "extra vigilant" as they head to work after the deadly explosions in London.

Bush said he spoke with federal homeland security officials back in Washington.

"I instructed them to be in touch with local and state officials about the facts of what took place here in London," Bush told reporters from a summit of world leaders here.

Bush urged caution "as our folks start heading to work."

"The war on terrorism goes on," he said. "We will not yield to these people."

The president offered the "heartfelt condolences" of the American people to the victims and their families in London.

British Prime Minister Tony Blair left the summit being held at a posh resort here to rush to London. Bush said Blair would "carry a message of solidarity with him" to London.

(Copyright 2005 by The Associated Press. All Rights Reserved.)

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